用途
項目中使用了 dubbo，注冊中心使用的 zookeeper，使用 zookeeper 實現了一個簡單的分布式鎖（依賴 curator），因為配置文件存在 dubbo.registry 配置，為了直接使用這個地址來創建分布式鎖，寫了一個簡單的方法來提取 zookeeper 地址。
效果
dubbo.registry 有多種配置方式，支持所有情況，下面是常見的例子和提取結果：
zookeeper://localhost:2181zookeeper://localhost:2181?client=zkclientzookeeper://localhost:2181?backup=localhost:2182,localhost:2183zookeeper://localhost:2181?client=zkclient&backup=localhost:2182,localhost:2183------------結果------------Optional[localhost:2181]Optional[localhost:2181]Optional[localhost:2181,localhost:2182,localhost:2182]Optional[localhost:2181,localhost:2183,localhost:2183]
代碼
import java.util.Optional;public class ZookeeperURL { public static final String PREFIX = "zookeeper://"; public static final String BACKUP = "backup="; public static Optional<String> convertDubboRegistryToZookeeperURL(String dubboRegistry){ StringBuilder zookeeperURL = new StringBuilder(); if(dubboRegistry != null && dubboRegistry.startsWith(PREFIX)){ dubboRegistry = dubboRegistry.substring(PREFIX.length()); int index = dubboRegistry.indexOf("?"); if(index > 0){ zookeeperURL.append(dubboRegistry.substring(0, index)); dubboRegistry = dubboRegistry.substring(index + 1); String[] dubboRegistries = dubboRegistry.split("&"); for (int i = 0; i < dubboRegistries.length; i++) { if(dubboRegistries[i].startsWith(BACKUP)){ String[] backups = dubboRegistries[i].substring(BACKUP.length()).split(","); for (int j = 0; j < backups.length; j++) { zookeeperURL.append(",").append(backups[i]); } } } } else { zookeeperURL.append(dubboRegistry); } return Optional.of(zookeeperURL.toString()); } return Optional.empty(); } public static void main(String[] args) { System.out.println(convertDubboRegistryToZookeeperURL("zookeeper://localhost:2181")); System.out.println(convertDubboRegistryToZookeeperURL("zookeeper://localhost:2181?client=zkclient")); System.out.println(convertDubboRegistryToZookeeperURL("zookeeper://localhost:2181?backup=localhost:2182,localhost:2183")); System.out.println(convertDubboRegistryToZookeeperURL("zookeeper://localhost:2181?client=zkclient&backup=localhost:2182,localhost:2183")); }}總結
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